package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.BaseContext;
import com.itheima.common.CustomException;
import com.itheima.entity.*;
import com.itheima.mapper.OrdersMapper;
import com.itheima.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;


@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {


    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;
    /*
    * 用户下单
    * */

    @Transactional//在发送异常时，对数据库的操作进行回滚（避免一张表成功了，但另一张表没有对应数据）
    @Override
    public void submit(Orders orders) {
        //获得当前用户的id
        Long currentId = BaseContext.getCurrentId();

        //查询当前用户的购物车是否存在数据数据
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,currentId);
        List<ShoppingCart> shoppingCartList = shoppingCartService.list(lambdaQueryWrapper);


        if(CollectionUtils.isEmpty(shoppingCartList) || shoppingCartList.size()==0){
            throw new CustomException("购物车为空，不能下单");
        }
        //查询用户数据
        User user = userService.getById(currentId);
        //查询地址数据
        AddressBook addressBook = addressBookService.getById(orders.getAddressBookId());


        //向订单表插入数据，一条数据
        long orderId = IdWorker.getId();//订单号


        AtomicInteger amount = new AtomicInteger(0);//线程相关的知识

        //计算订单总金额
       List<OrderDetail> orderDetails = shoppingCartList.stream().map((item)->{
                OrderDetail orderDetail = new OrderDetail();
                //设置订单明细各个字段的值
               orderDetail.setOrderId(orderId);
               orderDetail.setNumber(item.getNumber());
               orderDetail.setDishFlavor(item.getDishFlavor());
               orderDetail.setDishId(item.getDishId());
               orderDetail.setSetmealId(item.getSetmealId());
               orderDetail.setName(item.getName());
               orderDetail.setImage(item.getImage());
               orderDetail.setAmount(item.getAmount());
               amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());//一次累加总金额
               return orderDetail;
        }).collect(Collectors.toList());


        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(currentId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        this.save(orders);


        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(lambdaQueryWrapper);


    }
}
